"Haunt You Every Day" is the fifth episode of the fourth season of Grey's Anatomy and the 66th produced episode of the series. It is also the 71st produced episode of the Grey's Anatomy franchise. It was broadcast on October 25, 2007.
Halloween dawns at Seattle Grace and Meredith begins to believe that her dead mother is haunting her and she and Richard both try to look for ways to put her to rest and reach closure about her death while Callie announces Izzie and George's affair to the entire hospital. Ava returns to see Alex who becomes conflicted by his desire to be with and his duties as a resident. Erica Hahn joins the staff of Seattle Grace, much to the dismay of Cristina.
This episodes' title references the song Haunt You Every Day, originally sung by Weezer
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